Earth, The Moon, and The Stars

In which direction does Earth's gravity pull?

• toward the sun

• toward the Earth's center

• toward the North Pole

• toward the tallest mountain

The force of gravity between two objects increases as they are

• spread apart

• moved closer together

• cooled

• heated

The sun's gravity is _____ Earth's because the sun is _____ than Earth.

• stronger than, smaller

• weaker than, bigger

• stronger than, bigger

• weaker than, smaller

How does the sun's gravity affect Earth?

• It causes objects to fall to Earth's surface

• It holds Earth in its orbit

• It causes the moon to orbit the Earth

• It causes objects on Earth to have weight

The moon's gravity is weaker than Earth's. If you went to the moon, you would

• shrink and become shorter

• weigh less than you do on Earth

• float off into space

• not jump as high as you do on Earth

The intense ______ at the core of a star causes it to produce light

• sound

• cold

• gravity

• heat

Why does only a small part of a star's light reach Earth?

• The sun absorbs most of the light

• The atmosphere blocks most of the light

• The light is destroyed by the darkness

• The light spreads out as it moves through space

Distances in space are so great, they are often measured in

• meters

• light-years

• feet per second

• centimeters

The sun has the highest apparent brightness to Earth because it

• is closer to Earth than any other star

• is larger than any other star

• produces more light than other stars

• is hotter than other stars

Earth's axis is an imaginary line that

• goes around the equator

• traces Earth's path through space

• goes from the North Pole to the South Pole

• extends from Earth to the sun